Fish in Mustard Sauce

Ingredients:
Fish fillets 1/2 kg
Turmeric 2 tsp
Salt to taste
Black mustard 1 tsp
Yellow mustard 1 tsp
Poppy seeds 1 tsp
Green chillies 3
Coconut 1/4 cup
Water 1/4 cup
Onion (quartered) 1
Thinly sliced ginger 1-1/2 inches
Plain yogurt 2 tbsp
Oil 1 tbsp
Mustard oil (recommended) 1 tbsp

Method:
In a bowl, combine the fish, 1 teaspoon turmeric and the salt. Grind the black and yellow mustard seeds and poppy seeds until smooth. Set aside. Blend 1 green chilli, coconut, and water to a paste. Transfer to a bowl. Add 1/2 teaspoon turmeric and generous pinch of salt. In the food processor, blend the onion and ginger to a rough paste. Transfer to a bowl. Stir in the yogurt, 1/2 teaspoon turmeric, and generous pinch of salt. Heat the mustard or regular oil. Add the fish and cook for 3 to 5 minutes until the fish turns opaque. Add the halved green chilli, the mustard paste, onion paste, and mustard oil, if using. Cover and cook over low heat until the fish is cooked through. Garnish with slivered chillies and serve with rice.